All Questions
11
questions
0
votes
2
answers
610
views
How fast will a resistor heat up under high power?
I am building a circuit for some induction coils on a coilgun, and it will draw about 1.75A from a 12V power source (I know it probably won't be very powerful, but it is difficult to find resistors ...
- 111
1
vote
3
answers
366
views
Can I increase the power rating of a film resistor if I increase the cooling?
I am trying to apply 1 kW of heat to an area of 10x10 mm and I am considering using a panel mounted film resistor.
One that meets my power requirements doesn't exist so I am wondering if I can go ...
0
votes
1
answer
110
views
Interpreting a datasheet of resistor for heat sink
I will have this 47k 50W wire wound resistor which will be across line and neutral which means 230 VAC rms. So the electrical power in theory will be V^2/R = 1.2 Watt.
How should one interpret this ...
- 2,217
0
votes
2
answers
866
views
MOSFET's getting too much heat up without any load
I am working on inverter, MOSFETs in h-bridge inverter goes heat up without any load attached. I also attached pull-up and pull-down resistor on it. here is my circuit duagram.
EDIT
Sources of PMOS ...
- 124
0
votes
1
answer
93
views
Selecting power resistor
I want to build a thermostat and I'm not sure what power resistor to choose. The thermostat will be build inside a broken microwave oven. The resistors will be connected to 230V AC and they will be ...
- 1
2
votes
2
answers
531
views
Thermal Management for Arcol HS50/HS100 50/100W Wirewound resistors
I'm designing a 100W dummy load for a guitar amplifier using Arcol HS50 and HS100 resistors. Here's a link to the datasheet:
http://www.arcolresistors.com/wp-content/uploads/2014/03/HS-Datasheet.pdf
...
- 501
0
votes
1
answer
328
views
Heat dissipation on high power resistor
A resistor (~1 cm x 1 cm x 4 cm) with I = 5 A and V = 10 V (P = 50 W) is perfectly attached (on the 1 cm x 4 cm side) to a flat copper piece with known thickness, D = 5 mm (no fins). Ambient T is 20°C....
0
votes
3
answers
4k
views
What heat sink should I use for this 50W resistor?
I want to run 80 Watts of power through 2 50W 1Ohm resistors:
http://www.upe-inc.com/upe-ate-resistors/wirewound-aluminum-housed-axial-resistor/
It's the RB50 series.
When trying to calculate what ...
- 149
0
votes
1
answer
755
views
12V DC LED and motor circuit - overheating
I'm trying to build a model lighthouse (don't ask). :-)
Essentially I'm trying to have an über-bright LED with a motor rotating at 2rpm, both powered from the mains (120V AC). The problem I am ...
2
votes
2
answers
2k
views
Sinking heat from resistors?
I'm new to PCBs and I'm working on a project in which I'm dropping ~22.8V across a resistor. I'm using 0.5W resistors (they'll be dissipating about 0.43W with my application). In my prototypes the ...
- 433
0
votes
1
answer
924
views
How to design a heat bed / radiator using resistors?
I have to add some resistors to an aluminium plate on a 3D printer, because it only goes to 67'C without foam insulation. The heated bed currently reads 1.6 ohms (90W at 12V)
I wish to add about 96W ...
- 949